CVE-2026-59949: medium-severity vulnerability in yawkat lz4-java
yawkat LZ4 Java: JVM Crash via Null Byte Array in lz4-java Streaming XXHash JNI (StreamingXXHash32JNI / StreamingXXHash64JNI)
Published
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.5%
yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.1, JNI-backed XXHash implementations fail to validate the byte array object and the off and len arguments in XXHashFactory.nativeInstance().hash32().hash(), XXHashFactory.nativeInstance().hash64().hash(), XXHashFactory.nativeInstance().newStreamingHash32().update(), and XXHashFactory.nativeInstance().newStreamingHash64().update(), allowing null arrays or oversized ranges to reach native code, read outside the Java array, and fatally terminate the JVM. This issue is fixed in version 1.11.1.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Affected products
yawkat · lz4-javaRelated CVEs — yawkat lz4-java
In the same product, most dangerous first.
CVE-2025-66566HIGHyawkat LZ4 Java has a possible information leak in Java safe decompressorEPSS 0.6%CVE-2026-106452MEDIUMyawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the stream headerEPSS 0.5%CVE-2026-106450MEDIUMyawkat LZ4 Java: LZ4FrameInputStream reallocates block buffers for every frame, allowing CPU and GC amplification from small inputsEPSS 0.5%CVE-2026-106449LOWyawkat LZ4 Java: LZ4BlockInputStream with stopOnEmptyBlock=false recurses once per empty block, causing StackOverflowErrorEPSS 0.4%CVE-2026-106453MEDIUMyawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte length header, so a 5-byte input triggers a 1 GiB allocation and OutOfMemoryErrorEPSS 0.4%CVE-2026-106451HIGHyawkat LZ4 Java: Native library extraction to a shared temporary directory is vulnerable to file replacement by another local userEPSS 0.1%